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Ikee is a worm that spread by means of SSH connections between jailbroken iPhones, iPads and iPod Touches. It was first discovered in 2009 and changes the user's wallpaper to a picture of Rick Astley, with the text ikee is never going to give you up.
It infected iDevices with OpenSSH installed with the default root password, alpine. On the infected devices, it scanned carrier IP ranges (and local IP ranges) for the same SSH port open with the default credentials. If found, the worm then spreads and the cycle is repeated.
There was also a variant of the worm known as iPhone/Privacy.A, which instead of changing the wallpaper, it stole personal information such as messages, contacts, photos and Apple ID information.
It is easy to protect the user's device from any worm like this. First; if OpenSSH is installed, change the root (and mobile) passwords to something memorable but not easy to guess, and definitely not the default.